[Phoenix-pm] inside out objects
Michael Friedman
friedman at highwire.stanford.edu
Tue Nov 22 22:24:49 PST 2005
So, I just read through _Perl Best Practices_ and it's fantastic.
It's even well written. And I agree with almost all of Damian's
recommendations for making more maintainable Perl code... all except
inside out objects.
However, as I've already had one tranformative religious experience
from this book (I've changed my braces style), I'm willing to give
the guy a chance on this one. But I need some more evidence.
Has anyone used inside out objects before? I completely believe that
they handle encapsulation much better, but what I don't buy is that
they're actually easier to maintain and equivalently easy to
understand as the "regular" hash-based objects are.
So, anyone have real world advice on using them?
-- Mike
PS - For those not in the know, inside out objects are identified by
a unique scalar that acts as an index into a list of hashes, one hash
for each attribute/field of the object. The values are held in the
set of hashes in a closure, so absolutely no one but the class itself
can access them. There is an example in the code block on http://
www.windley.com/archives/2005/08/best_practices.shtml, and other
examples elsewhere that I can't seem to find at the moment. :-(
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